Did you ever have that really cool cast reloading, cartridge design or rifle or revolver idea that you wished you'd tried but never did? I let myself be talked out of some and ended up regretting it.
There was the bolt action cast deer hunting rifle using 30-06 cases expanded to be as long and as large of a boolit diameter as workable in a given action... and head space on the case mouth as a 45ACP. Years later I read about somebody doing it. I ended up instead creating a smokeless reincarnation the 9.5x60R using 45-70 brass. But I still wish that big rimless had made it into my development notes.
Another idea was the .40 caliber Security Six using cartridges made from 30-30 brass. That was the late 70's before gun writers were paid to discover the magic of .40 calibers, but having what amounted to a souped up version of 38-40 in a Security Six without suffering from 38-40 brass appealed to me. Like a dummy I let a gunsmith talk me out of it. Never did look at whether a lever action would feed such a thing without hanging up but that was on my list to do.
Any how, it's all fun and I've been having a blast for half a century.
What were your ideas that should have made in to the range?